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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acb8229800d65856895b38a33caf4a9ae891bb5298e4da41f50742ea3c18f01b' 
  AND token = 'tnTieQDM39ALTZ4/EMohhHeVuE6YycGt+mx1bkn8/X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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