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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7a98abc6990477c0c6a7356ba345a80b481c152fc497f7ffdbcc8e1a46af4d2' 
  AND token = 'T0sxAuPMcc6PFxTF/zaN4J/+KES8KF7dbzhAinYu28M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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