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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '185cffa7ac859243da0d2aa399e036cd116973d5aa7838ef4ef99c424b733a17' 
  AND token = 'R1QdbSAdUbJCbLDw8RcFx7WpUXAy7AJ/juqgXK0A6Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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