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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7f31fc25ef7b0e2b0977d91cf990755b4c8270909f675b3b712706fa3bdd687' 
  AND token = 'Ox2F7++2KnSvkD1hHAabP2zZ4mAd6X2fsUif1+z7+is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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