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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c98fd79184d7449c855736c1b88c0a27ca8149bdf3672ff6cd81b6237d260463' 
  AND token = 'suO63O3zwcHPp/bXXTvb+nmPb/zU4T8YTMgyO99m26Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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