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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0335cd4c20207a6fc9ad6dd9f2c47296ef2f510383a072b75baaa4d58dceac5c' 
  AND token = 'hQVcRvF0jJOQTIzRQJIO5YDn39QGUDQCZv52xZQOz3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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