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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdb906d1f2aeab3b5cf68a5c1d4b1841e828ae4787ab3f6041eeeb87359632d5' 
  AND token = 'pkQXnZowx6+Q+yciVZheWUSo1ywShASKmuBp4SE+VHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}