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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b994fbe8a09ef8ddcc733663cd168708b75c6fb94fc305e754308c086284c351' 
  AND token = 'FlHQ85fQ6e7RM8jxlWIYYAcUNuogQ4b53EwsU32poTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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