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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6dd52b3e38594330e4823d693325eeeff77dfdeff74680754c8aa74903e58b4' 
  AND token = '0pEeoDpaNd5FRbTd9cOOV6ybWcU9Po5uLaLzgjK3A4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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