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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd375ec041eb41a64fd130bb938249d1f76fe548e88cdd0fb9c69b4641c95557b' 
  AND token = '+nqsLWTy0Uj1WeMKNOzo2Wad7HLkPvqX91SCtIP7hMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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