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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8ee6e6d40d386720e7412fc833c9d42615d8cacb721718e8edf38ea04a8604d' 
  AND token = 's/DvKQe0B14c+faIq21t929kDZZF6sqoRYmHoGwx2EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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