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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5fddcbd132c0e420ba959606170665156e841b69c894b9164f5ace346b41d39' 
  AND token = '+zldf4J0wopy/4jHGKPjRJ3XNHHCkfYt2pdPK4MTCfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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