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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a95de6d98398a36870ac2a9f7c8569ee9d95d11bcf85f0cc1f06e1eb23f0889' 
  AND token = 'VpsnoAO5m0pHTCnfu67MJ8NXYu5atgw/f774FSF2Jb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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