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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '390e1fcf2a1e6a53208ab5a29cce5a165b079d0f6a48427f3811455267c126ef' 
  AND token = 'kdEHRTmONecMnyR4Vn4++pupcD/47gI4xhiqNgK0n9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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