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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7317bca6d7dca73c0440ca0266f8c2ee6795dfe489ec22ec6c2d77495b4bfdf2' 
  AND token = '6+Th6OHUnaDeOuQysPFeWod4TLeOZ67ff42cWWQe4ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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