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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ed51fe3ce80c76f95c8ec215a0d5cf5b8b3bf40dca022f4b8f175eec3ad9073' 
  AND token = 'xTMu2BL/Rq6ckjaeXk56ThrTf0NCrXyKi3cIyvsarNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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