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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d65f90a10888999f599656687d58edf8b30ebf966b3e7d30ff2af3817abf528' 
  AND token = '7l5cN4nnUogIdE4lxms9he9IziJz8eVxBI1Ee2YOgoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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