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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26175cd0700074f27f8a0630740a952bb80f69e21dface79ec6e7a326a37cee0' 
  AND token = '22Fk/GQ7JtOWM0U2Qo7Yr2sSMbob6HAVo2mAHQ8T+kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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