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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db722299c0c4d0efe13678f7ad5befd1c00e46b24a5d6a0228caec8042e27ef0' 
  AND token = '/M1ytAKtQ6z3LHJdGFFJ69jdjEKoSa0rfbMMNzbmpbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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