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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a26e48a58a4128ca9d88ea451289b001cdc53506d75b0e7f7c3e4133222cdfd1' 
  AND token = 'EfKEKQKhgYyd35Bva0zOpajtrX3V6iCQ9P5TjVWxNhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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