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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '831bc21517ff7f8cbe4bf125e0f41f5107ea0235b20ed1378a10554f18bc2faa' 
  AND token = 'hR+bu5BJKx1q6mI4ybFASBeA5inBS/oo7VU2Y0gVDNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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