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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5aa0519a9769d97615cd0cf6f2786da01d7739025781015a9814b4fa403ab072' 
  AND token = 'o+TbZFYllIZx/FpU00TEBOA+b0FzdD/W6IynJIuRmUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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