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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fce0386695591ff4d3f5fa6e5b67bd75e52cdee947c777baa4ff547ff3738e7e' 
  AND token = 'cZpYXXt8HA1q6koJ1uzaNNvr4VVVxmI9Tn8Lpn2rBgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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