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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a233cc7fa9bf1bdbaeb697d107c1c20bf76bd55d810d94ba015a5b0950924d8d' 
  AND token = '1ZfbprYh5IIUYepFvlE4PVUYTyCEYC+YZcpaeylYdgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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