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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9ff33a6105cd26100372162eeb0e580b99b07fd79c7656dba5acb30a5a2b7a1' 
  AND token = '6Mu/FnO1eDjlhRxPLWAeFjeMcMSZ0b+qVlckeAz5PDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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