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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c38fa7298a342f34a66656c8bd48d1e68d9c61b068e614072958c01dc52264c' 
  AND token = 'yi9LYgOathnh7hrfy32zKS8KccwjiGRbuNwLe6MKycM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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