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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46d81dd2b947ecdde4da8090d82a340d51f723afbb2270a3430d9e4c388b67c4' 
  AND token = 'dIWdvSCwYtu52TN8m3iKAa9vP3HSkxkpVRFhXhdAdyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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