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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68a85f05ca9ae590c150e8c8b2dea0c77b20f4bf29534a8a88b158829908e16f' 
  AND token = 'ce5LmE5HIif3qy3/h+Ofhpvk/C4+piB1OC/rsFgjE/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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