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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9aaa3c8c6cc7a4a45161ab5bb860922b77f8cea9c2a78ff688c8652458f37441' 
  AND token = 'LU5hJ4iV1HZilU+ePTqpcHiHAPz7WeP+S+n6rbmJjow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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