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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '193e5c18806257c343317f5db1e291b50eb5cb85f9f1dddd769357c62e94f7d1' 
  AND token = 'EPbDPg6+wHn+9UmsabUOU1zuata9tsDuAdlrua2YM6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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