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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfe55ba0c5574c5b7b9c1e33223bf2937ec161b090ec61aa70657ec9803fde3e' 
  AND token = 'FvrpmgmKynYbc05UYdOYHa1ay3fFgAg4dAaSN6Hv4Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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