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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b8342adfd5054f0fd5a25bd2c246a5b8abc1cb96e36db5696499bc2e187a312' 
  AND token = 'TzQmAQLVe7f5hkz6Tm9bm0Yr/nNENIBSXzeybw6zDqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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