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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67b5d8beea79cda5d92292b77164b8bbe99202ecbe2c8142bd087570c6017e6e' 
  AND token = 'Cic9nxNYhZXqmt0USl1cF8wfmFLsAUYwgUXpJxblB7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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