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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '489a197f4ba43cf0658a8439a0705e353fc3ff96751dd38e192d42684f2108af' 
  AND token = 'RaIEc3+8B6SokipCEiNKEoYHfyfHb4ujlwrGVy+Ox5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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