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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '055a66a484521327445f33a2f935ba4aef4e06ab17f13df7af3513ece6c4f8b2' 
  AND token = 'YncVMrR8DtFXSrHK2Bu9f8iMrzbY7llaN/Gk0jCq3yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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