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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df962cdf71a73fdb0d92b38391113fb8ce062b72150275c57ca8d27411f19bc7' 
  AND token = 'oLOU/WxALicLwZfA9P6CWeCNh+zHI7J9e5Ci1sQYUPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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