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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '129c487dbcdbd6622d33de7e25f1aa6dd5c86fd59565a97910188ebe33deacde' 
  AND token = '/Etxnh5g5Lvm5iTzzr/9LZIxL6RhIGfzB6/asjwG4Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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