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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18e6b97fb7c21f011158d5f1311da5946d00fc1d80d9ec99b0d0919d443f82bf' 
  AND token = 'y+2bvgIemvEMAVzwQTCrdMzqFJD7FrG11t4DUPZzaiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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