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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '148cf0b2f072dd0949042de01143face9ad19e1ad155b1b561e8c57a70ab5e5a' 
  AND token = 'ooGDgOFUuFzmOshQ4++cF5XFwv5gJLy00EDmysmJTzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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