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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4f6ab0a3164517e4d6efe7ece69d5255752710f55a8c652ebe3b24c36242525' 
  AND token = '46Ey9XpTIPh8xiG9gUIMB86G1Y1vyGZmOkk01woBUOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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