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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddd474f06ec153445adcbe1fb39bb68068866eebf8c6724853f43cac41e12ed7' 
  AND token = 'WqtXV7+JBEJNjiS/6wO4/SP1ycActO3aBC+8sBOx2sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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