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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6b0ec0cba9e8d588d292b7ef00a5eb36e9fef09298a07a62e6d1487c276e3ab' 
  AND token = '6uCc7bPAekj8tsCcoFJVDHiS1k0+agjU10S0il7Chuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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