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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '622f432a9010990d0346bf8a81daf46b87c282118bf706837c6899503e1c123b' 
  AND token = 'WQTcKUvJafTNL038iR4ygCL9+ZOCUN+NL7+Mn5a0Dgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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