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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd6772bb2b9fac7068d747b5ea3dc6617f4e49a4518a97be31e5c06b819feeb0' 
  AND token = 'y2AAMNN/Q8JJN2lb9o7kDsH7COPrc16xt0IU0u3/AEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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