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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0396e4df115818573a9b805712d09e89acb5ee2f97bd6205018e815a4e4b75e' 
  AND token = 'Ats92TeEesytEEp3Raf96olC3YfQv8TNYLDsvWQ16uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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