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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '950aeb4343478e832f00bf90e102e827ba35848817681f89b24aa753a835f0ac' 
  AND token = 'nb/0cymuAK81ZRuYYNOCJ923XFtZA4w2K+alX5/tI6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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