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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4edc53525729aab3cdcee4ed568980bdd4fb7fb80362df2cecd8ab922b684096' 
  AND token = 'fM/sqoxWQbJDU4l0/6KpPETsMg8gbz1/5G9LNqjTuHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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