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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '194972d6dc10498b7add491520a0d0862a1f12fc1d083e47579e6db0013c0bcb' 
  AND token = 'tPMBoAnoq/gjb3sx3x3g7vH7jme8eJcmM8eXRv9ukBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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