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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '587da6a9f27b941f7c59711bf626d15ce75c60838c7726f731218a74f7780e0a' 
  AND token = 'z5yvCZRiHm51Hv87ItQqdQ3mapRm7KW0LwTmghQa6uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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