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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b40831e09922f7e1ca8aeb0717c99e27be81779bafef2ca044a09851890b55a' 
  AND token = 'PH3IqQemhsUbdfRiJ2vEFNSaHBGvPC1cw0+utNKWgVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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