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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a583a23e2831a4d022b81406176ce3c94594463c3ed3d3189adb0d68bea41db' 
  AND token = 'wraYqP24TMJHCkIZB8PNaNOHJ9e5L89PGEQsGqTRArI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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