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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0fb7f67bf01a28aa842ef06557fde63bfe6d35df544fcbb5b915816c32d4c03' 
  AND token = 'NMOpnKH3pr3OjhBikxyhfHahoKvR9+rCW6/kAIMUX6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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