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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fa01861e07b33fa15eb6bb023d85db9e4191339e8c35df93e7fdfa4e2335ef2' 
  AND token = '/A1VKzfU66PAIbhZeKIwZWE6ZjDaEuPSJEnriCPEGQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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