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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9029dd3a308174f72332d53857e89394631de7cf8bd209e7d6e3da324bc5c2f7' 
  AND token = 'T7iAebtoY+7a+7bHKDL8D/j7NWi0xFN1+f9CCaEjwVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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