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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc9846429e5679a5b126558beeb6c7112a6d70c05f63589d91e2558df85f5ab4' 
  AND token = 'b2x6veRIv9sIlUJTe3JYVLrnKrewELBjy8X55Lq/IDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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