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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2db7581d672d165846007cade7755146213acbc92f9369e1d40663d17c246686' 
  AND token = 'a185pDhUIWt5eE3HUfzJ08C9I18zNxnAemfBfcq8dWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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