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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9349503af32ee271be0f8bf4e72c0232405b09466330f88af8139701172fe898' 
  AND token = 'Tz6KtM7lOJV0CRuHg92+NIiiHKRuBN34bvklLGWxcME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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