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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e306ba95e1e9c946adce38b96ed5bc9aac058686b0ddfab7c8cdd0700186293' 
  AND token = '6xB/8Dw4Ny09YlnsT1rER3BXA+BsVeEe1IhiShyB5cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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