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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebdaff6a2feb1231c1533b51738b1b633dd4d0fc2260ad524139a1fc55d565e1' 
  AND token = 'geyML7f3q1ZW7kE1OdGPaaxySo+ixU8WGIqAzXHWN/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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