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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60275c1b55ab6d9824ade8a54a30e64b58a95081af0e2d4156511694d34dccd8' 
  AND token = 'K5D9HRZ7JcRNqtVf+u3Y+s0EO59KZHnr04/4+qxBI5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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