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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2930b26db0499ba13e655387a2983994f40f42b8e118168282d8ac51881545df' 
  AND token = 'G40I0WezbSjm16bkQ0Hvt4TfuZCOAlvpBAzlvZAfwkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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