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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73f2c6e722179da6aa101f78480d09534a44ba2bd58ced937cf591cb8b983b63' 
  AND token = 'Ss223mhrjG6BaftinSkEd6qzrXAz3a52jgBryaY9Sz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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