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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff7ef828f201344344b30b57b4ea0c5d0b9917d7c2a42367b7b4a0ab52594e71' 
  AND token = 'PaDP29UP3bVbWX2JuI8F7vDuq7F12+Y9Ee9XB5rTzYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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