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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29d0b7f21809a1d0616b77c705c496b381222db30b707ff59c9bc95a8d882ad0' 
  AND token = 'Ei5zDK2N04+hc3sYqG4jd48KyzbD7hpkeBTuJi9acrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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